Sexes of Silkies

[Sprfrk]

Hiya newbie here. I currently have two silkie roosters and two hens approx 5months. I just purchased ten silkie chicks. All around 8 weeks. Some of them have large comb protruding already, and most have the flatter style. Are the big combs the boys? Have attached a couple of pics of the big combs (these are also on the largest chicks) and one of the flat (on the smaller ones).

 

[WallyBirdie]

Big combs are usually male.